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2013 Microwave Service Training All models Samsung HA Warranty • ALL Warranties are subject to change, always verify. • 1 Year Parts & Labor Base Warranty, Labor may not apply over 1 year • Some items may have longer Warranties, Check Owners Manual or 800-SAMSUNG – M/W oven 10 years on Magnetron Tubes • • • • No Damage Warranty, Consumer or Stock One Year, One Call for Consumer Education Stock Repair, 18 months from date of manufacture One Stock Repairs allowed under Warranty Specialty Tools Fine Point extended test probes Option 2 – safety pins Specialty Tools Wiring diagrams are available on GSPN, they are not with the product. Check your tools Do you have a M/W Survey Meter? Check your Calibration Date? Check if the leakage of microwave exceeds 5mW/cm2 before returning the oven to customers. Fast Track Troubleshooting 1 2 3 Fast Track Manual Example page Fast Track Manual Example page Microwave Cooking Wattage Test • Fill a 1000ml plastic room temperature container with cool tap water, temperature of the water should be 55-65 degrees • Stir water with a thermometer and record the water temperature, remove thermometer. • Place the container in the center of the lowest shelf or center of the bottom of the microwave. • For units less than 1550 watts, operate the oven on high for exactly 63 seconds. • Using the thermometer, stir the water to check the temperature of the water. • Subtract the starting temperature from the final temperature; this will be the temperature rise. • NOTE: Check line voltage under load, lower line voltage will lower the power output. Cooking Wattage Test Chart Temp Rise Output Temp Rise Output 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 194 232 271 310 349 387 426 464 504 542 581 620 659 697 736 775 814 852 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 891 930 969 1007 1046 1085 1124 1162 1201 1240 1279 1317 1356 1395 1434 1472 1511 1550 The Basics of Microwaves • Here is a quick check for the next “no heat” microwave repair. • Check for the 120vac at the primary of the high voltage transformer, in the cook mode. If you have no 120vac at the transformer, the problem is in the low voltage section. – Is L1 Missing, check the door switches & wiring. – Is Neutral missing, verify the relay is activating on the main PCB & Wiring. • If there is 120vac at the primary, check the high voltage transformer primary, & secondary resistances, the capacitor, the diode, the magnetron tube, and loose or broken wires • This procedure will keep you focused on the proper section, low voltage/high voltage, and reduce service time. Microwave is completely dead no interior light and no display with line Voltage present at outlet. Gain access to control panel by removing top grill. Test for 120vac at the primary interlock switch (lower switch) or L1 at connector. Voltage present indicates fuses and TCOs are good and problem is with the main control. No voltage present proceed to testing of fuses and TCOs (Thermal Cut Outs) CN201 pin 1 Primary interlock Switch SMH9187 PCB Power here means TCOs and line fuse are OK SMH9187 PCB RY203 closes the neutral line to the HV x-former. 120vac between these points, and the mag cooling fan is running, means 120vac to the HV x-former and main board is OK. Once the unit is removed from cabinet remove the case to access Magnetron TCO . Remove top access panel to reach cavity TCO . Replace parts as needed. Model specific component testing and location can be located in the service manual found here on GSPN in the service manual. Top View Cavity TCO can be found at the top in the area of light and stirrer motor on all models Mag TCO is N/C and will open at approx 300 F and reset at approx 145 F . The Base and cavity TCO are not resettable FUSE Access to the fuse and base TCO on most models can be gained through opening when control panel is removed. Some units may have two fuses and all units will have two lower TCOs. One is the Hood TCO and is N/O (104/158 F) and the other is a Thermal Cut Out and is N/C (opens at 248F) If both the fuse and TCO check good unit will have to be removed from cabinet for further diagnosing to check Cavity and Magnetron TCOs . CAUTION : Always be aware of capacitor location and discharge to prevent electrical shock. HOOD BASE FUSE Note: Placement of lower TCOs may very by model. Remember one is N/O and the other N/C Neutral is closed because secondary Sw is not activated Blue SMH9187 PCB CN201 disconnected removes neutral from the Lamp & Fan circuits for circuit check. Secondary Interlock Switch The door switches are 120vac. Resistance can cause the circuit not to work. Test switch with an ohm meter, on low resistance scale. Remove switch, press the switch at least 20 times, if any resistance this means the switch is bad. Wiring Diagram Testing components, High Voltage Danger High Voltage!!! Transformer & Magnetron Testing Remove wire leads 1. A resistance check between input terminals of the magnetron indicates 0-1Ω or is normal, ∞ is an open filament 2. A resistance check between the case of magnetron and one of input terminals of magnetron indicates ∞ (unlimited) is normal, any resistance is defective. Capacitor and Diode Testing High Voltage Capacitor 1. Check continuity of the capacitor with the meter set at the highest resistance scale. 2. Once the capacitor is charged, a normal capacitor shows continuity for a short time, and then indicates 9MΩ. 3. A shorted capacitor will show continuous continuity. 4. An open capacitor will show 9MΩ constantly. 5. Resistance between each terminal and chassis should read infinite. High Voltage Diode 1. Isolate the diode from the circuit by disconnecting its leads. 2. With the ohm-meter set at the highest resistance scale, measure across the diode terminals. 3. Reverse the meter leads and read the resistance. A meter with 9V or higher voltage batteries should be used to check the frontto back resistance of the diode. (Put 9v battery in series with the meter) (Otherwise, an infinite resistance may be read in both directions.). 4. The resistance of a normal diode will be infinite in one direction and several hundred KΩ in the other direction. Loose screw will cause arcing Microwaves • Unit stops working after 5 – 30 seconds – Check for Fan blade off Mag tube cooling fan motor • Order Motor/Blade • Glue blade on shaft after roughing shaft • Display has flashing and quits in a few seconds • Check for Mag tube leaking 24 Table of Contents Tools Fast Tracks Troubleshooting